This is the notification you'll see if you try to download any apps from the Android Market that allow you to create a Wi-Fi hotspot or tether to a computer.

AT&T has been sending text messages warning iPhone users to stop illegally tethering for a month or so, and now Android owners are getting the same treatment.

This event marks a watershed moment for Google and their Android Market. Along with the Grooveshark ordeal, we're starting to see more indicators that Android is not necessarily as open as it once was across all carriers.

Most tethering apps on the Android Market are currently unavailable for users on T-Mobile, AT&T, and Verizon.

In what we assume to be a part of their continuing effort to brand themselves as an alternative to Verizon or AT&T, Sprint has not asked Google to remove the tethering apps.

According to Engadget, a few apps are still left up for grabs, albeit most likely temporarily. PC World pegged some of the most popular apps you'll no longer be able to install: Easy Tether, Internet Sharer, Klink, PDAnet and Tether for Android.

You can still tether legally, of course, but it's going to cost you at least $15 or $20 per month to do so, depending on your carrier. Until now, Android users have been tethering for free, similar to how iPhone jailbreakers have been using MyWi to tether for free for years.

If you're on Verizon or T-Mobile, you can install as many tethering apps as you'd like as long as they come from external sources (which you'll have to seek out). If you're on AT&T, you are currently unable to download from any external sources whatsoever (including Amazon's App Store).